RIO TINTO AUSTRALIAN EXPLORATION PIT. LIMITED · bo rio tinto australian exploration pit. limited melbourne, australia project=-pit}> 7/103report no. =-1958/6the prosnc'fs por aj,luvi.al

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RIO TINTO AUSTRALIAN EXPLORATION PIT. LIMITEDMELBOURNE, AUSTRALIA

PROJECT=- Pit}> 7/103

REPORT No. =- 1958/6

THE PROSnC'fS POR AJ,LUVI.AL AND OTlmR

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NORTH EASTERH TA,S1WHA.

by~

J. H. Rattigan

8D/25A

DATE_ April, 1958~

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. There is some chance that if T~ueS can be provedover a depth of ~, '0 feet. there ~ resuJ.t in two orthree are.. of ~ 000 acres in extent.

lor each are., the following e.timtes ma.y betaken.-

(a) Im,se I 1000 :It 4840 :It i2 • 46,400.000 yu.

(b) ~ • sq 0.4 lbs/yard

(0) ;.otal t1Jl oQRtent. 46.000.000 :It to :It n :It•• 6000tons

(d) ~ I If such figures oould be realiMd. Sn.shallow dredgiJlg 1II1ght be po••i ble ifoontoU1'll are t ....OUl'IIble. md for eacharea • dredge treating ..... 2,000,000yaro per year would have • 24 year lifefor an ann,.a' production of 250 tcma Snper annUL

'lYith such deposits, the possibility al~s existsof a much larger operation if deep ground can be proved,or if they oould be supp1emented by atur tJP8. of ground suohas deep leads or the shjngle of Foster. Jlarshes.

7. /3RALLO! DJPOsr:gg. SOUTgm ;SOgBXJJ'Id PLtTliS

The terral n here is UJI1farm and fairly leye1 overwide areas. Four pa" work1Dgs in .outhem parts of theplain showed rich sh."OW ground. IIDoh priTAte .ooutboring has probably been done in the area., b1n reoords arelost or nner kept,. and it 18 doubtful. "ther the are.was tested in the J.1ght of dredging. Though stann' ferousground ..., be erratio, _the .cattered rioh W011d.JIgs, .ha" OWground. and fll1r~ UJI11'Ol'Il terrain, daud ....ooutboring be dons to test for a property or properties on thefollowing .cale.

Area IDepth IIardage •Tin Content II4fe •

8. E

lrOOO acres'0'n,OOO,oooVillus. 0.4 lb/o.yard) 6.000 ton Sn.

year••t 250 tons an. per S1 nua

The~ .-'] JII1Des on the Great Borthern Plainon the northem bank ar. the Ringaroo-. lIUggest that .~:1"urther testiJIg of this area be oonsidered. DepOll1ts in'the area 1noJ.uae deep leads. estuarins wuh and allUT1alterraces.

There are prospeat. of~ .-11 1D41Tidualdepoa1t. (~. produation of 50 tons pltr an",- oyer •15 year life). There are also prorate of dre"~ng areasof sq. 20.000,000 yarde with. tat tin content of 2,000tons Sn. All~ face. and ... boring by D81'set hanbeen done in the area. no scout hole .. .ugsested for ourpreliminary testing. J. fIlller exaination of this area,and reoords relating to 1t. i. to be -.1e before mareconcrete reco....,".tions for testing can be mate.

S.. 100 .quare 11111.. of prosp80'iTe oountry ooourwithin our per1ll1ta in B.E. T.....'a. T1II'oughout this 18l'gearea are soattered JIIIIJq moderate and 81IIa" work1ngs, fro. whiohJIlore than 50 000 tons of O&88iter1te haTe bem waa.. The work­ings are re rioted to ahell 08= ~~.' areas of theT~Basins, and where a water suppq .. readily available. and

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7. If the scout bores to test the JI81n RingaroomaLead in the Boob7&lla distriot show IIlI10h greater depthsthan the prellJldn,ry seiBJD10 estimates, the J.ead mightprove an uneoOlll.OII1o proposition as regards workiDg,unJ.ess tin vaJ.ues in the gutter are IIlI10h rioher thanoan be reasonably expeoted. If no vaJ.ues are seen inthe upper notion of Tertiary strata, or if vaJ.ues onbottom are poor, testing of the J.ead might well beabandoned if depths exoeed 250', as other prospectsdemand more atw.ntion by virtue of oheaper testingand observed indioations of tin.

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AlltlJ. 21st. J.956.

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RIO TlNTO A.USTRALIAN EXPLORA.TlON PTY. LIMITED

413C23

SKLTGH PLAN /UUSTRAT/NG EXT£NT OFTERT/ARY BASINS ANO TYPES OFPOBS/BlL TIN DEPOSITS

S.P.i.:123 R/N(jAROOMA AREA-NW. TA.9.

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AMG REFERENCE POINTS ADDED

.Deeper Tertiary Basins with8'tan n-iferoU8 sedi1nenO

Pre-Tertiary bedrock uJiin some Tertia ryrtnnnants and Qua/;ernary atlu viaLs

.Boundary 0/' Tertiary.Basins

- ( ~Inferred positions '?f .Deep .£eads

.Id·tterSym-bo18 iUu8trati':'{7 tyl'''s ?/!!roundul/z.ich }nay occur in varioU6 flarts ¥ T~rt£a-ry

BasznsMajor JJeep Leads

....7Ifedi/~rn. !J!J ,.,

...·,11011 ""

.£sluarinf' bottom oS- l~pper le.'e/IlJa.sh bandd'Quu/ernary Leadsalluvial TerracesMarine ." '--'

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Pretilninary Scout/Bore Si-teOtherSuyg-ested Shallow Hand Bores

~-",..._~ Sei.srn--LC Traverses

Cape Portland

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NlAYllN6AROOMA

800BVflLLfl BOOBf/flLLt)

RIVER PLillNoS

SEtTION ALONG LONG AXIS OF(6ENEULLY FOLLOWIN6

NORTH TaEN DING

BRISEIS

MINE

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aooaULLA USIN aETWEEN DERaY ANDINFEllED MAIN llNGAROOMA LEAD.)

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: 8008f/19LL.Q,I OELT19IIII1

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EAST TREnDIN' SECTION ACROSS aOOIYALLA lAS Irt aETwEEN LITTLE M1. HORROR AND DORSET FLAn.

I-MAIN

W AREA B .. I RINGQROOMA I • AREA C .. I E'B19NCP LITTLE LEAD? H,QSTIES OORSET FL,QTS

MINE MTHORROR WORKIN6S RING,QROOM,Q RIVERI

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noaTH un TRENDING SECTION AClOSS GREAT NORTHERN PLAIN 'AUN aETWEENMT. CAMERON AND THE RINGAlOOMA TIEl.

HEPROSPECT---j

III

M19VFI(LIJ' :. RINGPROOM19

PflMOCK: TIER: __~I ,,

I--MAYFIELD- LOCHABER LEAD

LOCHABER LEADI

STINKIN6 M19VFIELIJI

CREEl( FL,QTS

l,.MINE AREA.j,,

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!--MACGREGORP8ERF()I/LE

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sWMTCPMERON

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EAn TRENDIN' SECTION ALONGFROM ao08YALLA

wB008l/flLL,Q

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PL,QINS

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FOSTERS

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LONG AXIS OF THE 6REAT NORTHERN ~LAIN ,ASINDELTA TO tAPE PORTLAND ROAD.

BROWN'S PROSPECT LOCHABER LEAD

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'I~===~I PIU- TERTIARY 8ASEMENT

TE,f'TIARY 8ASALT

TE,f'TIARY - OC/.QTE,f'NARY SEIJ/MENTS

KNOWN STANNIFEROUS OCCVRENCES

POSSI8LE STANNIFEROVS OCCVRENCES

RIO TINTO AUSTRALIAN EXPLORATION PTY. LIMITED.

DIAGRAMMATIC SKETCH SECTIONS ILLUSTRATING OLtURENCEOF ACTUAL ANb POSSIBLE TIN DEPOSITS Hi THE 8008VALLA

AnD 6REAT NORTHERN PLAin aASINS. NE TASMANIA,.

Plan Ni T407